2009-2017年连续GNSS测量对土耳其地壳应变的数值模拟

IF 0.9 Q4 REMOTE SENSING Journal of Geodetic Science Pub Date : 2017-10-26 DOI:10.1515/jogs-2017-0013
K. Ansari, O. Corumluoglu, S. Sharma
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引用次数: 14

摘要

摘要利用土耳其永久GNSS网络(TPGN)和国际GNSS服务(IGS) 2009 - 2017年9年的观测数据,对土耳其的地壳应变进行了研究。研究GNSS站点的位置变化,了解全国的坐标可靠度、震间和同震效应、线速度和三维主应变。坐标信度研究表明,2013年和2015年的水平和垂直残差比2009年和2011年的水平和垂直残差在每个坐标100 mm以上,比2017年的水平和垂直残差高10倍。基线长度相对于任意0 -o_set的变化表明,大多数站点在−10至10 mm之间有位移,但有些站点的变化更大。这些位移主要与土耳其构造板块运动、区域地壳变形以及nss定位的少量误差有关。位于土耳其各地的大多数GNSS站点速度为研究提供了重要信息。GNSS数据显示,相对于欧亚大陆的安纳托利亚板块在土耳其中部向西移动,在土耳其西部开始向西南移动。安纳托利亚向西运动从安纳托利亚中部的20 mm/yr逐渐增加到土耳其西南部的30 mm/yr。对爱琴海地区地壳应变的数值模拟表明,压缩主应变率1.0446×10−6最大,次主应变率为零。中安纳托利亚地区的应变明显以伸展变形为主,主应变率达到0.9589×10−6,伸展变形最大。马尔马拉地区网络受张拉主应变(0.6608×10−6)影响,地中海地区也有张拉主应变(0.5682×10−6)。目前对该地区GNSS数据的分析可能有助于了解该地区构造的稳定性和该国境内的长期地震应变。
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Numerical Simulation of Crustal Strain in Turkey from Continuous GNSS Measurements in the Interval 2009–2017
Abstract The present study investigates the crustal strain in Turkey by using data from the Turkish permanent GNSS network (TPGN) and international GNSS services (IGS) observations for a period of 9 years, 2009 t0 2017. The positional variation of GNSS sites is studied to understand the coordinate reliability, interseismic and coseismic effects and linear velocities as well as three dimensional principal strains across the country. The study of coordinate reliability shows that the horizontal and vertical residuals in 2013 and 2015 are of the order of 100 mm per coordinate or higher than those of 2009 and 2011 and 10 times higher than those of 2017. The changes in baseline length relative to an arbitrary zero-o_set for the selected period shows that the most of the sites have displacement in the interval −10 to 10 mm but some sites have larger variations. These displacements are mostly related to motion of the Turkish tectonic plate, regional crustal deformation and small amounts of errors inGNSS positioning. The most GNSS site velocities located all over Turkey give significant information for the study. The GNSS data shows that the Anatolian plate relative to the Eurasia is moving in a western direction in the central part of Turkey and starts to move in a south-westerly direction in the west part of the country. The westward motion of Anatolia increases gradually from 20 mm/yr in central Anatolia to 30 mm/yr in south-west Turkey. The numerical simulation of the crustal strain in the Aegean region shows a maximum 1.0446×10−6 compressional principal strain rate while the second principal strain rate is zero. The strain in Central Anatolia is evidently dominated by extensional deformations and the principal strain rate reaches to 0.9589×10−6 with maximum extension. The Marmara Region network is subject to an extensional principal strain (0.6608×10−6) which is also revealed in the Mediterranean Region with a 0.5682×10−6 extension. The present analysis of GNSS data over the region may complement towards the understanding of the stability of regional tectonics and long term aseismic strain inside the country.
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来源期刊
Journal of Geodetic Science
Journal of Geodetic Science REMOTE SENSING-
CiteScore
1.90
自引率
7.70%
发文量
3
审稿时长
14 weeks
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